package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.task.WebSocketTask;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @author 李治$
 * @date 2024/8/6$
 * @description
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WebSocketServer webSocketServer;


    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional // 开启事务
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO){

        //1. 处理各种业务异常（地址为空、购物车为空）
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
         if(addressBook==null){
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        //查询当前用户的购物车数据
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if(shoppingCartList==null || shoppingCartList.size() == 0){
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //2. 向订单表插入1条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();
        //3. 向订单明细表插入n条数据
        for (ShoppingCart cart : shoppingCartList){
            OrderDetail orderDetail = new OrderDetail(); //将购物车中的数据复制到订单明细中
            BeanUtils.copyProperties(cart,orderDetail);
            orderDetail.setOrderId(orders.getId()); //设置当前订单明细关联的订单id
            orderDetailList.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetailList);

        //清空当前用户的购物车数据
        shoppingCartMapper.deleteByUserId(userId);

        //封装VO返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderAmount(orders.getAmount())
                .orderNumber(orders.getNumber())
                .orderTime(orders.getOrderTime())
                .build();

        return orderSubmitVO;
    }

    /**
     * 用户端历史订单分页查询
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    public PageResult pageQuery4User(int pageNum, int pageSize, Integer status){
        //设置分页
        PageHelper.startPage(pageNum,pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        //分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<Orders> list = new ArrayList();


        //查询出订单明细，并封装入OrderVO进行响应
        if (page != null&& page.getTotal() > 0){
            for(Orders orders : page){
                Long orderId = orders.getId(); //订单id

                //查询订单明细
                List<OrderDetail> orderDetail = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO(); //将查询结果封装成OrderVO
                BeanUtils.copyProperties(orders,orderVO);
                orderVO.setOrderDetailList(orderDetail); //设置订单明细

                list.add(orderVO);//封装到list集合
            }
        }
        return new PageResult(page.getTotal(),list);
    }

    /**
     * 用户端查询订单详情
     * @param id
     * @return
     */
    public OrderVO details(Long id){
        //根据id查询订单
        Orders orders = orderMapper.getById(id);

        //查询该订单对应的菜品/套餐明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //将该订单及其详情封装到OrderVO中并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders,orderVO); //将订单数据复制到orderVO中
        orderVO.setOrderDetailList(orderDetailList); //将订单明细数据封装到orderVO中

        return orderVO;
    }

    /**
     * 用户端取消订单
     * @param id
     * @throws Exception
     */
    public void userCancelById(Long id) throws Exception{

        //根据id查询订单
        Orders ordersDB = orderMapper.getById(id);


        //校验订单是否存在
        if(ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }


        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if(ordersDB.getStatus() >2){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders = new Orders(); //设置订单状态为已取消
        orders.setUserId(ordersDB.getUserId()); //


        //如果订单处于带接单状态下取消，需要进行退款
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            //调用微信支付退款接口 ，由于这里没有真的用到微信接口，所以这里直接修改支付状态
//            weChatPayUtil.refund(
//                    ordersDB.getNumber(), //商户订单号
//                    ordersDB.getNumber(), //商户退款单号
//                    new BigDecimal(0.01),//退款金额，单位 元
//                    new BigDecimal(0.01));//原订单金额


            //修改支付状态为 退款
            orders.setPayStatus(Orders.REFUND);
        }

        //更新订单状态、取消原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 用户端再来一单
     * @param id
     */
    public void repetition(Long id){

        //查询当前用户id
        Long userId = BaseContext.getCurrentId();

        //根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        //将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            //将原订单详情里的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart,"id");
            shoppingCart.setUserId(userId);//设置用户id
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());


        //将购物车对象批量添加到数据库
        shoppingCartMapper.insetBatch(shoppingCartList);
    }


    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(String.valueOf(userId));

       /* //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }*/


        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "ORDERPAID"); // 添加如下代码
        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class); // 修改为 OrderPaymentVO 类型的对象
        vo.setPackageStr(jsonObject.getString( "package")); // 设置 package 字段的值

        // 为微信支付成功的数据库订单状态更新，定义一个修改方法
        Integer orderPaidStatus = Orders.PAID; // 支付状态，已支付
        Integer orderStatus = Orders.TO_BE_CONFIRMED; // 订单状态，待接单

       // 发现没有将支付时间 check_out 属性赋值，所以在这里更新
        LocalDateTime check_out_time = LocalDateTime.now(); // 获取当前时间

        // 获取订单号
        String orderNumber = ordersPaymentDTO.getOrderNumber();

        log.info("调用 updateStatus。用于替换微信支付更新数据库状态的问题");
        // 更新订单状态
        orderMapper.updateStatus(orderStatus, orderPaidStatus, check_out_time, orderNumber);

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单号查询当前用户的订单
        Orders ordersDB = orderMapper.getByNumberAndUserId(outTradeNo, userId);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        // 通过 Websocket 向客户端推送消息 type orderId content
        Map map = new HashMap();
        map.put("type", 1); // 1表示来单提醒， 2表示客户催单
        map.put("orderId", ordersDB.getId());
        map.put("content", "订单号：" + outTradeNo);

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);

    }

    /**
     * 用户催单
     * @param id
     */
    public void reminder(Long id){

        //根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        //校验订单是否存在
        if(ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        Map map = new HashMap();
        map.put("type", 2); // 1表示来单提醒， 2表示客户催单
        map.put("orderId", ordersDB.getId());
        map.put("content", "订单号：" + ordersDB.getNumber());
        String json = JSON.toJSONString(map);
        //通过 Websocket 向客户端推送消息
        webSocketServer.sendToAllClient(json);
    }


    /**
     * 管理端订单分页查询
     * @param ordersPageQueryDTO
     * @return
     */
    public PageResult conditionService(OrdersPageQueryDTO ordersPageQueryDTO){
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize()); // 分页插件

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO); // 分页查询

        //部分订单状态，需要额外返回订单菜品信息，将Orders转换为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page){
        //需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();//订单菜品信息集合

        List<Orders> ordersList = page.getResult(); //获取分页查询结果
        if(!CollectionUtils.isEmpty(ordersList)){
            for (Orders orders : ordersList){
                //将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                //将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }


    /**
     * 各个状态的订单数量统计
     * @return
     */
    public OrderStatisticsVO statistics(){
        //根据状态，分别查询出待接单、待派送派送中的订单数量
        Integer toBconfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        //将查询出的数据封装到orderStatisticsVO中响应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBconfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }


    /**
     *  接单
     * @param ordersConfirmDTO
     */
    public void confirm(OrdersConfirmDTO ordersConfirmDTO){
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 拒单
     * @param ordersRejectionDTO
     */
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception{
        //根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());

        //只有存在且状态为2（待接单）才可以拒单
        if(ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //支付状态
        if(ordersDB.getPayStatus().equals(Orders.PAID)){
            //支付状态为已支付，需要退款
            String outTradeNo = ordersDB.getNumber();
            String refund = weChatPayUtil.refund(outTradeNo, outTradeNo, ordersDB.getAmount(), ordersDB.getAmount());
            log.info("申请退款：" + refund);
        }


        //拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);
    }


    /**
     * 取消订单
     *
     * @param ordersCancelDTO
     */
    public void cancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus == 1) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }

        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }


    /**
     * 派送订单
     *
     * @param id
     */
    public void delivery(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);
    }


    /**
     * 完成订单
     *
     * @param id
     */
    public void complete(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }



}
